Sprinkler arm

Abstract

Disclosed is an improved sprinkler arm rotatable in and out of a stream of water. In particular, the reaction surface of a sprinkler arm's spoon is improved to direct more water close to the sprinkler. The reaction surface in the preferred embodiment is provided at least one groove which directs some of the water downward from the rest of the water exiting the reaction surface. An alternate embodiment employs at least one pin in the reaction surface instead of or in combination with at least one groove. The improved spoon applies more water near the sprinkler ("enclosed water") without interfering with maximum distance of the water when the arm is rotated out of the stream ("canon shot").

What is claimed is: 
     
       1. A sprinkler arm comprising: a elongated member rotatably attachable to an impact sprinkler;   a window disposed in said member for the passage of incident liquid therethrough; and   a spoon disposed at one end of said elongate member proximate said window, said spoon defining a smooth reaction surface and at least one groove in said reaction surface for directing a first portion of the incident liquid more downwardly than a second portion of the incident liquid, said groove defining a first portion spaced from said window and extending parallel to said reaction surface and a second portion extending from said first portion and being inclined downwardly with respect to said first portion.   
     
     
       2. The sprinkler arm of claim 1 wherein said second portion of said groove is disposed at an angle of about 15 to 25° downwardly with respect to said first portion. 
     
     
       3. The sprinkler arms of claims 1 or 2 including a second groove in said reaction surface, said second groove extending parallel to said first groove.